Orifice Flange

Teshi Fittings, a premier manufacturer of pipe fittings, offers high-quality Orifice Flanges designed for various industries including Petroleum, Chemical, Hydraulic, Food, and more. Crafted with meticulous precision and adherence to international quality standards, our Orifice Flanges provide precise measurement and control in piping systems. With a commitment to excellence and customer satisfaction, Teshi Fittings delivers superior performance and durability in every flange, offering tailored solutions to meet specific project requirements. Experience the difference with Teshi Fittings’ Orifice Flanges and trust in our expertise for all your piping needs.

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Specification
Material & Grades
Dimensions

Standard Specification of Orifice Flange

Dimensions	ANSI B16.5, ANSI B16.47 Series A & B, ASA, API-605, MSS SP44, AWWA, Custom Drawings
Size	1/2″ (15 NB) to 48″ (1200NB)
Flange Face Types / Connection Type	Flat Face Flange (FF), Raised Face Flange (RF), Ring Joint Flange (RTJ), Lap Joint Flange, Male and Female Flange (M&F), Large and Small Tongue-and-Groove Flange (T&G)
DIN	DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
BS	BS4504 , BS4504, BS1560, BS10
Class	150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
Class / Pressure Rating	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Material & Grades of Orifice Flange

Stainless Steel	ASTM A-479, A-182, 304, 304L,304H,304S, 316, 316L,316 Ti, 316H, 309, 310, 310S, 317L, 321, 347, 409, 410, 420, 430, 440, 446, 904L. etc.
Duplex & Super Duplex Steel	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 & ASTM / ASME A/SA 182, A240 F 44, F 45, F51, F 53, F 55, F 60, F 61
Carbon Steel	ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Low Temperature Carbon Steel	ASTM A350, LF2, LF3
Alloy Steel	ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Nickel Alloy	Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)

Dimension of Orifice Flange

ORIFICE FLANGE CLASS 300 DIMENSIONS

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	Welding Neck Length	RF Dia.	RF Height	PCD	Orifice Hole dia	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	I
1	25	125	36.6	54	33.4	81	50.8	2	88.9	6.4	4	5/8	125	3/4	M16	4.5
1 1/2	40	155	36.6	70	48.3	84	73	2	114.3	6.4	4	3/4	135	7/8	M20	6.5
2	50	165	36.6	84	60.3	84	92.1	2	127	6.4	8	5/8	125	3/4	M16	7
2 1/2	65	190	36.6	100	73	87	104.8	2	149.2	6.4	8	3/4	135	7/8	M20	7.5
3	80	210	36.6	117	88.9	87	127	2	168.3	9.5	8	3/4	135	7/8	M20	9.4
4	100	255	36.6	146	114.3	90	157.2	2	200	12.7	8	3/4	135	7/8	M20	13.2
6	150	320	36.6	206	168.3	98	215.9	2	269.9	12.7	12	3/4	135	7/8	M20	14.6
8	200	380	39.7	260	219.1	110	269.9	2	330.2	12.7	12	7/8	145	1	M24	30
10	250	445	46.1	321	273	116	323.8	2	387.3	12.7	16	1	165	1 1/8	M27	41
12	300	520	49.3	375	323.8	129	381	2	450.8	12.7	16	1 1/8	180	1 1/4	M30	62
14	350	585	52.4	425	355.6	141	412.8	2	514.4	12.7	20	1 1/8	185	1 1/4	M30	84
16	400	650	55.6	483	406.4	144	469.9	2	571.5	12.7	20	1 1/4	195	1 3/8	M33	111
18	450	710	58.8	533	457	157	533.4	2	628.6	12.7	24	1 1/4	205	1 3/8	M33	138
20	500	775	62	587	508	160	584.2	2	685.8	12.7	24	1 1/4	215	1 3/8	M33	171
24	600	915	68.3	702	610	167	692.2	2	812.8	12.7	24	1 1/2	240	1 5/8	M39	247

ORIFICE FLANGE CLASS 600 DIMENSIONS

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	Welding Neck Length	RF Dia.	RF Height	PCD	Orifice Hole dia	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	I
1	25	125	36.6	54	33.5	81	50.8	7	88.9	6.4	4	5/8	125	3/4	M16	5.5
1 1/2	40	155	36.6	70	48.3	84	73	7	114.3	6.4	4	3/4	135	7/8	M20	7.8
2	50	165	36.6	84	60.3	84	92.1	7	127	6.4	8	5/8	125	3/4	M16	8.3
2 1/2	65	190	36.6	100	73	87	104.8	7	149.2	6.4	8	3/4	135	7/8	M20	10.8
3	80	210	36.6	117	88.9	87	127	7	168.3	9.5	8	3/4	135	7/8	M20	12.6
4	100	275	38.1	152	114.3	102	157.2	7	215.9	12.7	8	7/8	150	1	M24	19
6	150	355	47.7	222	168.3	117	215.9	7	292.1	12.7	12	1	180	1 1/8	M27	37
8	200	420	55.6	273	219.1	133	269.9	7	349.2	12.7	12	1 1/8	195	1 1/4	M30	53
10	250	510	63.5	343	273	152	323.8	7	431.8	12.7	16	1 1/4	220	1 3/8	M33	86
12	300	560	66.7	400	323.8	156	381	7	489	12.7	20	1 1/4	230	1 3/8	M33	102
14	350	605	69.9	432	355.6	165	412.8	7	527	12.7	20	1 3/8	240	1 1/2	M36	150
16	400	685	76.2	495	406.4	178	469.9	7	603.2	12.7	20	1 1/2	260	1 5/8	M39	190
18	450	745	82.6	546	457.2	184	533.4	7	654	12.7	20	1 5/8	280	1 3/4	M42	240
20	500	815	88.9	610	508	190	584.2	7	723.9	12.7	24	1 5/8	300	1 3/4	M42	295
24	600	940	101.6	718	609.6	203	692.2	7	838.2	12.7	24	1 7/8	335	2	M48	365

ORIFICE FLANGE CLASS 900 DIMENSIONS

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	Welding Neck Length	RF Dia.	RF Height	PCD	Orifice Hole dia	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	I
1	25	150	38.1	52	33.5	83	50.8	7	101.6	6.4	4	7/8	150	1	M24	5.4
1 1/2	40	180	38.1	70	48.3	89	73	7	123.8	6.4	4	1	160	1 1/8	M27	7.8
2	50	215	38.1	105	60.3	102	92.1	7	165.1	6.4	8	7/8	150	1	M30	11.5
2 1/2	65	245	41.3	124	73	105	104.8	7	190.5	6.4	8	1	165	1 1/8	M27	15.8
3	80	240	38.1	127	88.9	102	127	7	190.5	9.5	8	7/8	150	1	M24	22
4	100	290	44.5	159	114.3	114	157.2	7	235	12.7	8	1 1/8	180	1 1/4	M30	22
6	150	380	55.6	235	168.3	140	215.9	7	317.5	12.7	12	1 1/8	195	1 1/4	M30	70
8	200	470	63.5	298	219.1	162	269.9	7	393.7	12.7	12	1 3/8	230	1 1/2	M36	119
10	250	545	69.9	368	273	184	323.8	7	469.9	12.7	16	1 3/8	240	1 1/2	M36	204
12	300	610	79.4	419	323.8	200	381	7	533.4	12.7	20	1 3/8	260	1 1/2	M36	303
14	350	640	85.8	451	355.6	213	412.8	7	558.8	12.7	20	1 1/2	280	1 5/8	M39	400
16	400	705	88.9	508	406.4	216	469.9	7	616	12.7	20	1 5/8	290	1 3/4	M42	510
18	450	785	101.9	565	457.2	229	533.4	7	685.8	12.7	20	1 7/8	330	2	M48	738
20	500	855	108	622	508	248	584.2	7	749.3	12.7	20	2	355	2 1/8	M52	932
24	600	1040	139.7	749	609.6	292	692.2	7	901.7	12.7	20	2 1/2	445	2 5/8	M64	1511

ORIFICE FLANGE CLASS 1500 DIMENSIONS

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	Welding Neck Length	RF Dia.	RF Height	PCD	Orifice Hole dia	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	I
1	25	150	38.1	52	33.5	83	50.8	7	101.6	6.4	4	7/8	150	1	M24	5.4
1 1/2	40	180	38.1	70	48.3	89	73	7	123.8	6.4	4	1	160	1 1/8	M27	7.8
2	50	215	38.1	105	60.3	102	92.1	7	165.1	6.4	8	7/8	150	1	M24	11.5
2 1/2	65	245	41.3	124	73	105	104.8	7	190.5	6.4	8	1	165	1 1/8	M27	15.8
3	80	265	47.7	133	88.9	117	127	7	203.2	9.5	8	1 1/8	185	1 1/4	M30	22
4	100	310	54	162	114.3	124	157.2	7	241.3	12.7	8	1 1/4	205	1 3/8	M33	22
6	150	395	82.6	229	168.3	171	215.9	7	317.5	12.7	12	1 3/8	265	1 1/2	M36	70
8	200	485	92.1	292	219.1	213	269.9	7	393.7	12.7	12	1 5/8	300	1 3/4	M42	119
10	250	585	108	368	273	254	323.8	7	482.6	12.7	12	1 7/8	345	1	M48	204
12	300	675	123.9	451	323.8	283	381	7	571.5	12.7	16	2	380	2 1/8	M52	303
14	350	750	133.4	495	355.6	298	412.8	7	635	12.7	16	2 1/4	415	2 3/8	M56	400
16	400	825	146.1	552	406.4	311	469.9	7	704.8	12.7	16	2 1/2	450	2 5/8	M64	510
18	450	915	162	597	457.2	327	533.4	7	774.7	12.7	16	2 3/4	500	2 7/8	M72	738
20	500	985	177.8	641	508	356	584.2	7	831.8	12.7	16	3	545	3 1/8	M76	932
24	600	1170	203.2	762	609.6	406	692.2	7	990.6	12.7	16	3 1/2	620	3 5/8	M90	1511

ORIFICE FLANGE CLASS 2500 DIMENSIONS

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	Welding Neck Length	RF Dia.	RF Height	PCD	Orifice Hole dia	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	I
1	25	160	38.1	57	33.5	92	50.8	7	108	6.4	4	7/8	150	1	M24	6.5
1 1/2	40	205	44.5	79	48.3	111	73	7	146	6.4	4	1 1/8	180	1 1/4	M30	13
2	50	235	50.8	95	60.3	127	92.1	7	171.4	6.4	8	1	185	1 1/8	M27	19
2 1/2	65	265	57.2	114	73	143	104.8	7	196.8	6.4	8	1 1/8	205	1 1/4	M30	24
3	80	305	66.7	133	88.9	168	127	7	228.6	9.5	8	1 1/4	230	1 3/8	M33	43
4	100	355	76.2	165	114.3	190	157.2	7	273	12.7	8	1 1/2	260	1 5/8	M39	66
6	150	485	108	235	168.3	273	215.9	7	368.3	12.7	8	2	350	2 1/8	M52	172
8	200	550	127	305	219.1	318	269.9	7	438.2	12.7	12	2	385	2 1/8	M52	261
10	250	675	165.1	375	273	419	323.8	7	539.8	12.7	12	2 1/2	490	2 5/8	M64	485
12	300	760	184.2	441	323.8	464	381	7	619.1	12.7	12	2 3/4	540	2 7/8	M72	730

Manufacturing process and features of Orifice Flange

Manufacturing Process:

Material Selection : Choose materials such as carbon steel, stainless steel, or other alloys based on the operating conditions and compatibility with the fluid being transported.
Flange Preparation : Begin with standard flange blanks or forgings, which are then machined to the required dimensions and specifications.
Bore Machining : Machine the central bore of the flange to accommodate the orifice plate. The bore size and shape are critical to ensure accurate flow measurement.
Facing and Surface Finish : Prepare the facing of the flange to ensure a smooth and flat sealing surface. This is crucial for achieving a leak-free connection and accurate flow measurement.
Orifice Plate Installation : Position and secure the orifice plate within the flange assembly. The orifice plate is typically placed between two Orifice Flanges and is designed with a precision-calibrated hole that controls the flow rate.
Final Assembly : Assemble the Orifice Flange with the orifice plate and the companion flange to create a complete measurement section within the pipeline.
Quality Control : Conduct dimensional inspections and testing to verify the accuracy of the bore size, alignment with the companion flange, and overall functionality in flow measurement applications.

Features of Orifice Flange:

Flow Measurement: Designed specifically for accurate measurement of fluid flow rates using an orifice plate.
Compatibility: Available in various materials and pressure ratings to suit different pipeline applications.
Leak-Free Sealing: Machined to ensure a tight seal with companion flanges, preventing leakage and maintaining system integrity.
Standardization: Manufactured according to industry standards such as ASME B16.36 or API 605, ensuring compatibility and interchangeability.
Versatility: Used in a wide range of industries including oil and gas, chemical processing, power generation, and water treatment for precise flow measurement and control.

Orifice Flanges are critical components in industrial processes where accurate flow measurement is essential for operational efficiency and regulatory compliance.

Application Of Orifice Flange

Oil and Gas Industry	Used in oil and gas pipelines for measuring and monitoring flow rates of crude oil, natural gas, and refined petroleum products. Orifice flanges play a crucial role in custody transfer applications and process control.
Chemical Processing	Found in chemical plants for precise measurement of flow rates in pipelines that transport corrosive chemicals, solvents, and acids. Orifice flanges ensure accurate dosing and mixing of chemicals for manufacturing processes.
Power Generation	Utilized in power plants, including thermal, nuclear, and renewable energy facilities, for monitoring flow rates of steam, water, and cooling fluids. Orifice flanges help optimize energy efficiency and ensure safe operation of turbines and boilers.
Water Treatment	Applied in water treatment plants for measuring flow rates of treated water, chemicals, and wastewater. Orifice flanges support efficient operation of filtration systems, chemical dosing, and water distribution networks.
Pulp and Paper Industry	Used in paper mills for flow measurement of pulp slurries, chemicals, and water used in paper manufacturing processes. Orifice flanges assist in controlling consistency and quality during production.
Food and Beverage Industry	Found in food processing plants for measuring flow rates of liquid ingredients, beverages, and food products. Orifice flanges contribute to accurate batching, blending, and filling operations.
Pharmaceutical Industry	Applied in pharmaceutical manufacturing facilities for measuring flow rates of sterile liquids and gases used in drug production. Orifice flanges ensure precise control over critical process parameters and regulatory compliance.
HVAC Systems	Employed in heating, ventilation, and air conditioning systems for measuring flow rates of fluids and gases in building HVAC networks. Orifice flanges help maintain optimal indoor air quality and energy efficiency.

Orifice Flange Available Types

Orifice Flange Manufacturer	Orifice Flange Exporter
Stainless Steel Orifice Flange	Forged Steel Raised Face Orifice Flange
Carbon Steel Orifice Flange	ANSI B16.47 Orifice Flange
Alloy Steel Orifice Flange Stockholder	Class 150 LBS Orifice Flange Stockiest
Nickel Alloy Orifice Flange Suppliers	MSS SP44 Orifice Flange
Inconel Orifice Flange Stockiest	Class 300 LBS Orifice Flange
Alloy Steel Orifice Flange Exporter	Class 600 LBS Orifice Flange
Duplex Steel Orifice Flange Stockists	DIN / EN Orifice Flange Manufacturers
Titanium Alloy Orifice Flange	ASME / ANSI B16.5 Orifice Flange
Super Duplex Steel Orifice Flange	ANSI / ASME Orifice Flange
Copper Nickel Orifice Flange	High Quality Orifice Flange

Frequently Asked Questions

Most frequent questions and answers

An orifice flange is a specialized type of flange used in conjunction with orifice plates for flow measurement in pipelines. These flanges are typically used in flow metering applications to measure the flow rate of liquids, gases, and steam. They provide a convenient means to install an orifice plate, which creates a pressure drop to calculate flow rate.

Orifice flanges are available in a variety of sizes to match different pipe diameters and pressure ratings. Standard sizes are provided, and custom sizes can be manufactured to meet specific needs.

Orifice flanges are installed by bolting them to the pipeline, with an orifice plate sandwiched between them. Proper installation includes ensuring the orifice plate is centered and securely clamped to prevent leakage. The flanges usually have tapped holes for differential pressure transmitters to measure the pressure drop.

Yes, custom manufacturing solutions for orifice flanges are available to meet specific requirements. Contact us with your detailed specifications, and we will work with you to produce flanges tailored to your needs.

The lead time for orifice flanges depends on the complexity and volume of the order. After reviewing your specifications, we will provide an estimated lead time. We are committed to delivering all projects on schedule while maintaining the highest quality standards.

Yes, orifice flanges are suitable for both liquid and gas applications, provided they are made from appropriate materials and installed correctly to handle the specific conditions of the system, including pressure and temperature.

Orifice flanges are commonly made from materials such as carbon steel, stainless steel, and alloy steel. The material choice depends on the specific requirements of the application, including the type of fluid or gas, temperature, pressure, and environmental conditions.

Orifice flanges are used primarily in flow measurement applications across various industries, including oil and gas, chemical processing, water treatment, and power generation. They are integral to systems requiring precise flow rate monitoring and control.

Orifice flanges are manufactured to comply with industry standards such as ASME B16.36, which specifically covers orifice flanges. They may also adhere to other relevant standards like ASME B16.5 or API standards, ensuring compatibility and reliability in various piping systems.

Orifice flanges offer several advantages, including:

Accurate Flow Measurement: Essential for precise flow rate calculation using orifice plates.
Ease of Installation: Simplifies the integration of flow measurement devices into piping systems.
Versatility: Suitable for a wide range of fluids, gases, and steam applications.
Compatibility: Designed to meet industry standards for seamless integration with existing systems.

Regular inspection of orifice flanges includes checking for signs of wear, corrosion, and damage. It is also important to ensure that the orifice plate remains clean and properly aligned, and that the differential pressure transmitters are functioning correctly.